How to Read Resistance Values using Analog Multitester

Summary

This instructional video teaches how to use an analog multi-tester to measure resistance values. It covers the calibration process, the use of different resistance multipliers, and how to interpret the readings. The video demonstrates measuring a carbon resistor's resistance, adjusting the tester's multiplier, and reading the ohm values. It also explains how to identify short circuits and open circuits, emphasizing the tool's importance in diagnosing electrical issues.

Takeaways

• 🔍 An analog multi-tester can measure resistance, current, and voltage values.
• 📏 To measure resistance, select the appropriate resistance multiplier (1, 10, 100, 1k, 10k, etc.).
• 🔧 Before measuring, calibrate the multi-tester by connecting the positive and negative probes until the pointer reads zero.
• ⚙️ If the pointer doesn't point to zero, adjust it using the ohm adjuster.
• 🔄 If the resistance value is too high, switch to a higher multiplier to get a more detailed reading.
• 📊 To read the resistance value, count the lines on the scale corresponding to the selected multiplier.
• 🔢 The final resistance value is calculated by multiplying the scale reading by the selected multiplier.
• 💡 A carbon resistor was used in the example, and its resistance was found to be approximately 560 ohms.
• 🌐 For a more precise reading, use a higher multiplier and recalibrate the tester accordingly.
• 🚨 A reading of zero ohms indicates a short circuit, while infinite resistance suggests an open circuit.
• 🔦 The multi-tester is a useful tool for diagnosing issues in circuits, such as shorts or open circuits.

Q & A

What are the three parameters that can be measured using an analog multimeter?

The three parameters that can be measured using an analog multimeter are resistance values, current, and voltage values.

How do you calibrate an analog multimeter before measuring resistance?

To calibrate an analog multimeter before measuring resistance, you connect the positive and negative probe. It is necessary that the pointer points at the zero value. If not, you adjust it using the ohm adjuster.

What are the resistance multipliers available on the multimeter?

The resistance multipliers available on the multimeter are 1, 10, 100, 1k, 10k, and 100k.

Why might the needle not move when measuring resistance with the multimeter set to a certain multiplier?

The needle might not move when measuring resistance because the selected multiplier is too low, indicating that the resistance value of the resistor might be higher than the range of the selected multiplier.

How do you read the resistance value on an analog multimeter?

To read the resistance value, you look at the position of the needle on the scale. You count the lines from zero to where the needle points and multiply by the selected multiplier to get the resistance value in ohms.

What does it mean if the multimeter's needle points to a high value when measuring a resistor?

If the multimeter's needle points to a high value when measuring a resistor, it indicates that the resistance is low, and a higher multiplier should be selected to get a more accurate reading.

How do you determine the appropriate multiplier for measuring a resistor's resistance?

You determine the appropriate multiplier by starting with a lower multiplier and observing the needle's movement. If the needle does not move significantly, you increase the multiplier until you get a clear and accurate reading.

What is the significance of the zero ohm reading on an analog multimeter?

A zero ohm reading on an analog multimeter indicates a short circuit, meaning there is no resistance between the points where the test probes are connected.

What does an infinite resistance value signify on an analog multimeter?

An infinite resistance value on an analog multimeter signifies an open circuit, meaning there is no continuity between the points where the test probes are connected.

How can you use a multimeter to check for defects in circuitry or wiring?

You can use a multimeter to check for defects in circuitry or wiring by measuring the resistance. If the resistance is zero, it may indicate a short circuit. If the resistance is infinite, it may indicate an open circuit.

What is the next step after measuring resistance with an analog multimeter?

The next steps after measuring resistance with an analog multimeter, as mentioned in the script, would be to learn how to measure current and voltage, which will be covered in subsequent videos.